Hydrogen production at intermediate temperatures with proton conducting ceramic cells:Electrocatalytic activity,durability and energy efficiency

作     者：Haoyu Zheng Feng Han Noriko Sata Rémi Costa Haoyu Zheng;Feng Han;Noriko Sata;Rémi Costa

作者机构：Institute of Engineering Thermodynamics German Aerospace Center (DLR) Institute for Building Energetics Thermotechnology and Energy Storage (IGTE) University of Stuttgart 

出 版 物：《Journal of Energy Chemistry》 (能源化学（英文版）)

年 卷 期：2023年第86卷第11期

页      面：437-446,I0010页

核心收录：

学科分类：081702[工学-化学工艺] 08[工学] 0817[工学-化学工程与技术] 

基　　金：The China Scholarship Council is acknowledged for the doctoral scholarship of Haoyu Zheng(201806160173) The German Federal Ministry for Education and Research is acknowledged for funding via the Project ARCADE(03SF0580A) 

主　　题：Steam electrolysis Hydrogen production Proton conducting ceramics Intermediate temperature Energy efficiency 

摘      要：Proton conducting ceramic cells(PCCs)are an attractive emerging technology operating in the intermediate temperature range of 500 to 700℃.In this work,we evaluate the production of hydrogen at intermediate temperatures by proton conducting ceramic cell electrolysis(PCCEL).We demonstrate a highperformance steam electrolysis owing to a composite positrode based on BaGd_(0.8)La_(0.2)Co_(2)O_(6-δ)(BGLC1082)and BaZr0.5Ce0.4Y0.1O3-δ(BZCY541).The high reliability of PCCEL is demonstrated for 1680 h at a current density as high as-0.8 A cm^(-2)close to the thermoneutral cell voltage at 600℃.The electrolysis cell showed a specific energy consumption ranging from 54 to 66 kW h kg^(-1)that is comparable to state-of-the-art low temperature electrolysis technologies,while showing hydrogen production rates systematically higher than commercial solid oxide ceramic cells(SOCs).Compared to SOCs,the results verified the higher performances of PCCs at the relevant operating temperatures,due to the lower activation energy for proton transfer comparing with oxygen ion ***,because of the p-type electronic conduction in protonic ceramics,the energy conversion rate of PCCs is relatively lower in steam *** faradaic efficiency of the PCC in electrolysis mode can be increased at lower operating temperatures and in endothermic conditions,making PCCEL a technology of choice to valorize high temperature waste heat from industrial processes into *** increase the faradaic efficiency by optimizing the materials,the cell design,or the operating strategy is a key challenge to address for future developments of PCCEL in order to achieve even more superior techno-economic merits.